import { ComplementHomeServer, createHS, destroyHS } from "./homerunner";
import { IAppserviceRegistration, MatrixClient, MembershipEventContent, PowerLevelsEventContent } from "matrix-bot-sdk";
import { mkdtemp, rm, writeFile } from "node:fs/promises";
import { BridgeConfig, BridgeConfigRoot } from "../../src/config/Config";
import { start } from "../../src/App/BridgeApp";
import { RSAKeyPairOptions, generateKeyPair } from "node:crypto";
import path from "node:path";
import Redis from "ioredis";

const WAIT_EVENT_TIMEOUT = 20000;
export const E2ESetupTestTimeout = 60000;
const REDIS_DATABASE_URI = process.env.HOOKSHOT_E2E_REDIS_DB_URI ?? "redis://localhost:6379";

interface Opts {
    matrixLocalparts?: string[];
    config?: Partial<BridgeConfigRoot>,
    enableE2EE?: boolean,
    useRedis?: boolean,
}

interface WaitForEventResponse<T extends object = Record<string, unknown>> {
    roomId: string,
    data: {
        sender: string, type: string, state_key?: string, content: T, event_id: string,
    }
}

export class E2ETestMatrixClient extends MatrixClient {

    public async waitForPowerLevel(
        roomId: string, expected: Partial<PowerLevelsEventContent>,
    ): Promise<{roomId: string, data: {
        sender: string, type: string, state_key?: string, content: PowerLevelsEventContent, event_id: string,
    }}> {
        return this.waitForEvent('room.event', (eventRoomId: string, eventData: {
            sender: string, type: string, content: Record<string, unknown>, event_id: string, state_key: string,
        }) => {
            if (eventRoomId !== roomId) {
                return undefined;
            }

            if (eventData.type !== "m.room.power_levels") {
                return undefined;
            }

            if (eventData.state_key !== "") {
                return undefined;
            }

            // Check only the keys we care about
            for (const [key, value] of Object.entries(expected)) {
                const evValue = eventData.content[key] ?? undefined;
                const sortOrder = value !== null && typeof value === "object" ? Object.keys(value).sort() : undefined;
                const jsonLeft = JSON.stringify(evValue, sortOrder);
                const jsonRight = JSON.stringify(value, sortOrder);
                if (jsonLeft !== jsonRight) {
                    return undefined;
                }
            }

            console.info(
                // eslint-disable-next-line max-len
                `${eventRoomId} ${eventData.event_id} ${eventData.sender}`
            );
            return {roomId: eventRoomId, data: eventData};
        }, `Timed out waiting for powerlevel from in ${roomId}`)
    }

    private async innerWaitForRoomEvent<T extends object = Record<string, unknown>>(
        {eventType, sender, roomId, stateKey, eventId, body}: {eventType: string, sender: string, roomId?: string, stateKey?: string, body?: string, eventId?: string}, expectEncrypted: boolean,
    ): Promise<WaitForEventResponse<T>> {
        return this.waitForEvent(expectEncrypted ? 'room.decrypted_event' : 'room.event', (eventRoomId: string, eventData: {
            sender: string, type: string, state_key?: string, content: T, event_id: string,
        }) => {
            if (eventData.sender !== sender) {
                return undefined;
            }
            if (eventData.type !== eventType) {
                return undefined;
            }
            if (roomId && eventRoomId !== roomId) {
                return undefined;
            }
            if (eventId && eventData.event_id !== eventId) {
                return undefined;
            }
            if (stateKey !== undefined && eventData.state_key !== stateKey) {
                return undefined;
            }
            const evtBody = 'body' in eventData.content && eventData.content.body;
            if (body && body !== evtBody) {
                return undefined;
            }
            console.info(
                // eslint-disable-next-line max-len
                `${eventRoomId} ${eventData.event_id} ${eventData.type} ${eventData.sender} ${eventData.state_key ?? evtBody ?? ''}`
            );
            return {roomId: eventRoomId, data: eventData};
        }, `Timed out waiting for ${eventType} from ${sender} in ${roomId || "any room"}`)
    }

    public async waitForRoomEvent<T extends object = Record<string, unknown>>(
        opts: Parameters<E2ETestMatrixClient["innerWaitForRoomEvent"]>[0]
    ): Promise<WaitForEventResponse<T>> {
        return this.innerWaitForRoomEvent(opts, false);
    }

    public async waitForEncryptedEvent<T extends object = Record<string, unknown>>(
        opts: Parameters<E2ETestMatrixClient["innerWaitForRoomEvent"]>[0]
    ): Promise<WaitForEventResponse<T>> {
        return this.innerWaitForRoomEvent(opts, true);
    }

    public async waitForRoomJoin(
        opts: {sender: string, roomId?: string}
    ): Promise<{roomId: string, data: unknown}> {
        const {sender, roomId} = opts;
        return this.waitForEvent('room.event', (eventRoomId: string, eventData: {
            sender: string,
            state_key: string,
            content: MembershipEventContent,
        }) => {
            if (eventData.state_key !== sender) {
                return;
            }
            if (roomId && eventRoomId !== roomId) {
                return;
            }
            if (eventData.content.membership !== "join") {
                return;
            }
            return {roomId: eventRoomId, data: eventData};
        }, `Timed out waiting for join to ${roomId || "any room"} from ${sender}`)
    }

    public async waitForRoomInvite(
        opts: {sender: string, roomId?: string}
    ): Promise<{roomId: string, data: unknown}> {
        const {sender, roomId} = opts;
        return this.waitForEvent('room.invite', (eventRoomId: string, eventData: {
            sender: string
        }) => {
            if (eventData.sender !== sender) {
                return undefined;
            }
            if (roomId && eventRoomId !== roomId) {
                return undefined;
            }
            return {roomId: eventRoomId, data: eventData};
        }, `Timed out waiting for invite to ${roomId || "any room"} from ${sender}`)
    }

    public async waitForEvent<T>(
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        emitterType: string, filterFn: (...args: any[]) => T|undefined, timeoutMsg: string)
    : Promise<T> {
        return new Promise((resolve, reject) => {
            // eslint-disable-next-line prefer-const
            let timer: NodeJS.Timeout;
            const fn = (...args: unknown[]) => {
                const data = filterFn(...args);
                if (data) {
                    clearTimeout(timer);
                    resolve(data);
                }
            };
            timer = setTimeout(() => {
                this.removeListener(emitterType, fn);
                reject(new Error(timeoutMsg));
            }, WAIT_EVENT_TIMEOUT);
            this.on(emitterType, fn)
        });
    }
}

export class E2ETestEnv {

    static get workerId() {
        return parseInt(process.env.JEST_WORKER_ID ?? '0');
    }

    static async createTestEnv(opts: Opts): Promise<E2ETestEnv> {
        const workerID = this.workerId;
        const { matrixLocalparts, config: providedConfig  } = opts;
        const keyPromise = new Promise<string>((resolve, reject) => generateKeyPair("rsa", {
            modulusLength: 4096,
            privateKeyEncoding: {
                type: "pkcs8",
                format: "pem",
            },
            publicKeyEncoding: {
                format: "pem",
                type: "pkcs1",
            }
        } satisfies RSAKeyPairOptions<"pem", "pem">, (err, _, privateKey) => {
            if (err) { reject(err) } else { resolve(privateKey) }
        }));

        const dir = await mkdtemp('hookshot-int-test');

        // Configure homeserver and bots
        const [homeserver, privateKey] = await Promise.all([
            createHS([...matrixLocalparts || []], workerID,  opts.enableE2EE ? path.join(dir, 'client-crypto') : undefined),
            keyPromise,
        ]);
        const keyPath = path.join(dir, 'key.pem');
        await writeFile(keyPath, privateKey, 'utf-8');
        const webhooksPort = 9500 + workerID;

        if (providedConfig?.widgets) {
            providedConfig.widgets.openIdOverrides = {
                'hookshot': homeserver.url,
            }
        }

        if (providedConfig?.github) {
            providedConfig.github.auth.privateKeyFile = keyPath;
        }

        opts.useRedis = opts.enableE2EE || opts.useRedis;

        let cacheConfig: BridgeConfigRoot["cache"]|undefined;
        if (opts.useRedis) {
            cacheConfig = {
                redisUri: `${REDIS_DATABASE_URI}/${workerID}`,
            }
        }

        const config = new BridgeConfig({
            bridge: {
                domain: homeserver.domain,
                url: homeserver.url,
                port: homeserver.appPort,
                bindAddress: '0.0.0.0',
            },
            logging: {
                level: 'debug',
            },
            // Always enable webhooks so that hookshot starts.
            generic: {
                enabled: true,
                urlPrefix: `http://localhost:${webhooksPort}/webhook`,
            },
            listeners: [{
                port: webhooksPort,
                bindAddress: '0.0.0.0',
                resources: ['webhooks'],
            }],
            passFile: keyPath,
            ...(opts.enableE2EE ? {
                encryption: {
                    storagePath: path.join(dir, 'crypto-store'),
                }
            } : undefined),
            cache: cacheConfig,
            ...providedConfig,
        });
        const registration: IAppserviceRegistration = {
            as_token: homeserver.asToken,
            hs_token: homeserver.hsToken,
            sender_localpart: 'hookshot',
            namespaces: {
                users: [{
                    regex: `@hookshot:${homeserver.domain}`,
                    exclusive: true,
                }],
                rooms: [],
                aliases: [],
            },
            "de.sorunome.msc2409.push_ephemeral": true
        };
        const app = await start(config, registration);
        app.listener.finaliseListeners();
        
        return new E2ETestEnv(homeserver, app, opts, config, dir);
    }

    private constructor(
        public readonly homeserver: ComplementHomeServer,
        public app: Awaited<ReturnType<typeof start>>,
        public readonly opts: Opts,
        private readonly config: BridgeConfig,
        private readonly dir: string,
    ) { }

    public get botMxid() {
        return `@hookshot:${this.homeserver.domain}`;
    }

    public async setUp(): Promise<void> {
        await this.app.bridgeApp.start();
    }

    public async tearDown(): Promise<void> {
        await this.app.bridgeApp.stop();
        await this.app.listener.stop();
        await this.app.storage.disconnect?.();

        // Clear the redis DB.
        if (this.config.cache?.redisUri) {
            await new Redis(this.config.cache.redisUri).flushdb();
        }

        this.homeserver.users.forEach(u => u.client.stop());
        await destroyHS(this.homeserver.id);
        await rm(this.dir, { recursive: true });
    }

    public getUser(localpart: string) {
        const u = this.homeserver.users.find(u => u.userId === `@${localpart}:${this.homeserver.domain}`);
        if (!u) {
            throw Error("User missing from test");
        }
        return u.client;
    }
}